The active ingredient in this herb is thymol and it is found in the roots, and contains fungicidal properties. It also possesses helenalin which is an antiinflammatory. When made into a solution of 50% Arnica gel and applied topically to hands with osteoarthritus, it is equal to a solution of 5% ibuprofen it is great relief for tired ol’ joints. Recipe for making the herbal oil is also included.